1 /*

     2  * OpenAL Bridge - a simple portable library for OpenAL interface

     3  * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>

     4  *

     5  * This program is free software; you can redistribute it and/or modify

     6  * it under the terms of the GNU Lesser General Public License as published by

     7  * the Free Software Foundation; version 2 of the License

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12  * GNU Lesser General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU Lesser General Public License

    15  * along with this program; if not, write to the Free Software

    16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

    17  */

    18 

    19 #ifndef _OALB_ENDIANNESS_H

    20 #define _OALB_ENDIANNESS_H

    21 

    22 #include "globals.h"

    23 

    24 

    25 #ifdef __CPLUSPLUS

    26 extern "C" {

    27 #endif 

    28 

    29 

    30 /* check compiler requirements */

    31 #if !defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)

    32 #error Do not know the endianess of this architecture

    33 #endif

    34 

    35 

    36 /* use byteswap macros from the host system, hopefully optimized ones ;-) 

    37  * or define our own version, simple, stupid, straight-forward... */

    38 #ifdef HAVE_BYTESWAP_H

    39 #include <byteswap.h>

    40 #else        

    41 #define bswap_16(x)	((((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8))

    42 #define bswap_32(x)	((((x) & 0xFF000000) >> 24) | (((x) & 0x00FF0000) >> 8)  | \

    43 (((x) & 0x0000FF00) << 8)  | (((x) & 0x000000FF) << 24) )

    44 #endif /* HAVE_BYTESWAP_H */

    45 

    46 

    47 /* swap numbers accordingly to architecture automatically */

    48 #ifdef __LITTLE_ENDIAN__

    49 #define ENDIAN_LITTLE_32(x) x

    50 #define ENDIAN_BIG_32(x)    bswap_32(x)

    51 #define ENDIAN_LITTLE_16(x) x

    52 #define ENDIAN_BIG_16(x)    bswap_16(x)

    53 #elif __BIG_ENDIAN__

    54 #define ENDIAN_LITTLE_32(x) bswap_32(x)

    55 #define ENDIAN_BIG_32(x)    x

    56 #define ENDIAN_LITTLE_16(x) bswap_16(x)

    57 #define ENDIAN_BIG_16(x)    x    

    58 #endif

    59         

    60         

    61 #ifdef __CPLUSPLUS

    62 }

    63 #endif

    64 

    65 #endif /*_OALB_ENDIANNESS_H*/